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viscoplasticity

thumb|upright=1.1|Figure 1. Elements used in one-dimensional models of viscoplastic materials.

Article

20 sections

Contents

History
Phenomenology
Strain hardening test
Creep test
Relaxation test
Rheological models of viscoplasticity
Perfectly viscoplastic solid (Norton-Hoff model)
Elastic perfectly viscoplastic solid (Bingham–Norton model)
Elastoviscoplastic hardening solid
Strain-rate dependent plasticity models
Perzyna formulation
Duvaut–Lions formulation
Flow stress models
Johnson–Cook flow stress model
Steinberg–Cochran–Guinan–Lund flow stress model
Zerilli–Armstrong flow stress model
Mechanical threshold stress flow stress model
Preston–Tonks–Wallace flow stress model
See also
References

thumb|upright=1.1|Figure 1. Elements used in one-dimensional models of viscoplastic materials.

Viscoplasticity is a theory in continuum mechanics that describes the rate-dependent inelastic behavior of Solids. Rate-dependence in this context means that the deformation of the material depends on the rate at which loads are applied. The inelastic behavior that is the subject of viscoplasticity is plastic deformation which means that the material undergoes unrecoverable deformations when a load level is reached. Rate-dependent plasticity is important for transient plasticity calculations. The main difference between rate-independent plastic and viscoplastic material models is that the latter exhibit not only permanent deformations after the application of loads but continue to undergo a creep flow as a function of time under the influence of the applied load.